49 



open air. It consists of a 

 Tin-lined wooden cylinder a 

 between which and a cor- 

 rugated cylinder is a per- 

 forated steam coil o with 

 steam entering at h, thus 

 heating the water to the de- 

 sired temperature read off on 

 the thermometer b. The over- 

 flow water escapes at p and 

 is emptied at n. 



The milk flows from the 

 tank x on to the curved 

 cover which is perforated so 

 as to distribute the milk 

 evenly on the inside of the 



torn and out by i and k, the thermometer m showing the 

 temperature. 



Dr. Flelschman heated 1,250 fibs, of milk per hour from 66 

 to 140 Fah. with the heating water only 158. 



Thiel used a similar constructed cooler, but of course any 

 kind of cooler can be used. 



Kelch's (Germany) heater and cooler is show r n in Fig. 46, 

 with a sectional view in Fig. 47. It consists of two cylinders 

 A and B, the latter set in the former. The narrow space be- 

 tween them K is used for either heating or cooling the milk 



Fig. 46. 



4 



Fig. -: 



